Charles egan



(No Model.)

' O. EGAN.

MECHANICAL TELEPHONE.

No. 269,030. Patented Dec. 1 2, 1882.

INVENTOR ATTORNEYS.

N. PETERS. PMlo-Lrthngnphu. Wuhinglon D c UNITED STATES PATENT OFFICE,

CHARLES EGAN, OF ZANESVILLE, OHIO, ASSIGNOR TO GEORGE M. JE\VETT,

OF SAME PLACE.

MECHANICAL TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 269,030, dated December12, 1882,

(X0 model.)

To all whom it may concern:

Be it known that 1, CHARLES EGAN, of Zanesville, in the'county ofMuskingum and State of Ohio, have invented a new and useful Improvementin Mechanical Telephones, of which the following is a full, clear, andexact description.

The object of my invention is to increase upon the line the vibrationsgiven to the diaphragm by the voice, so as to insure greater loudnessand clearness of tone; and to that end the invention consists inemploying two diaphragms, which are connected by wires that diverge fromthe center ofthe outer diaphragm, and areattached to the inner one atpoints between its center and edge, as shown and described.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorrespoiiding parts in all the figures.

Figure l is a front view of the instrument. Fig. 2 is a cross-section ofthe same. Fig. 3 is a face view of the multiplying-diaphragm.

A is the base uponwhich the instrument is supported by posts a a.

B is the instrument proper, of which b is the apertured bottom piece,and c is a box fitted with mouth-piece d.

e is a diaphragm fitted beneath the mouthpiece d,"and f is a seconddiaphragm, fitted over the aperture in the bottom. piece, I).

g g are wires, preferably four in number, connected at the center of thediaphragm c, and

also connected at their other ends to the dia phragm f about half-waybetween its center and outer end. Wires g are taut, and to the center ofthe second diaphragnnf, is connected the main wire it.

In operation the outer diaphragm, a, being vibrated by the act ofspeaking into the mouthpiece, the vibrations are communicated by thewires 9 to the second diaphragm,f, and the wiresg being connected at adistance from the center of the diaphragm f, the vibrations are 5consequently amplified at the center of the second diaphragm, and theseamplified vibrations pass upon the main-line wire.

lhe instrumentis provided with an electric call-bell, i, andcircuit-closer k for calling in the usual manner.

Having thus described my invention, I claim as new and desire to secureby Letters Patent The combination of two diaphragms and the wires g,which are attached to the outer dia- 53 phragin at its center, divergingthence toward the inner one, to which they are connected at pointsbetween its center and edge, substantially as described.

